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post #6 of (permalink) Old 30th August 2009
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Well as far as I am aware, you do not need a catalyst, but you must be able to meet the emissions standards set with a catalyst, which are clearly near impossible to get on most cars without a catalyst. The 1992 law for catalysts within the EU may have been transposed and enacted in UK law based on emissions, but I do not know. More likely it was a manufacturer requirement and then backed up in operations by emission laws (i.e. Euro 3).

I think it does answer the question, if tested with your catalyst during a MOT and then removed, clearly the emissions will be higher and may breach the above regulation.

If tested without a catalyst and passes, then it probably won't breach the above regulation.

I don't think this is a well understood area.
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